Better to buy a high end network player with a DAC?

The only advantage of internal DAC is convenience.  YMMV. 

The only advantage of internal DAC is convenience.

Again, people making claims with absolutely no comprehension of what they are talking about.

Can you explain to me how increasing the complexity and room for error in a given electrical circuit, and increasing the path the signal has to travel is in any way more beneficial?

Right now i am using a Nucleus connected via usb audioquest carbon cable to  a chord tt2 dac.

higher frequencies seem rough and abit harsh.  So i am thinking about the luman x1.  Maybe it will be better.

Melco is indeed a player with a NAS.  No DAC included, which was the point.  I’m talking about their player NAS combo, not the switch, so that comment is a non sequiter.
  Regarding iron lung, what do I need to defend?  I merely said that many players are offered sans DAC.  Scan a catalog from a major retailer and you find a bunch.  I didn’t say putting it all under one bonnet was a bad idea, just that the original premise of the OP, that players that come without DACs are bad, was incorrect 

Mr mahler,
didnt say players without dacs are bad.

i said its tough to get the higher end players without a dac, eg lumen x1, dcs bartok.  The lumin u1 is without dac, and it is a very good player.  The x1 has more to offer relating to the player, but it also includes a dac.

and maybe there is merit in getting a dac built into a player.  
You dont find higher end processors with an amp and there is a clear reason for this. Quality higher stereo preamps wouldnt dream of having an amp.

not the case with a player where it may offer an advantage when including a dac.